Oliver 550 Diesel

I have a question regarding my new to me 1958 Oliver 550 Diesel. On the intake side of head, directly opposite each injector there is a 4 piece plug assembly that I'm sure is more than just a "plug". Can someone explain the what and why of these for me. Thank you
 
Under those plugs are the energy cells, the injectors spray fuel into the heated air in the cell. That's where the flame starts and then blows out of the cell above the
piston for the power stroke.
 

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